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gtk2/gtk/gtkcolorbutton.c
Hiroyuki Ito efaf99b039 ColorButton: Don’t destroy dialog @ ::delete-event 
Without specifically connecting ::delete-event to something, the dialog
will be destroyed when it is closed, for example by pressing Esc. This
meant that when dismissing it this way, unlike by pressing Cancel, any
custom palette would be lost when the dialog was next opened, and so on.

Resolve this by making ::delete-event just do GTK_RESPONSE_CANCEL, so
closing the dialog has the same effect as clicking its Cancel button.

https://bugzilla.gnome.org/show_bug.cgi?id=787444
2017-09-12 20:52:43 +01:00

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/*
* GTK - The GIMP Toolkit
* Copyright (C) 1998, 1999 Red Hat, Inc.
* All rights reserved.
*
* This Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/* Color picker button for GNOME
*
* Author: Federico Mena <federico@nuclecu.unam.mx>
*
* Modified by the GTK+ Team and others 2003. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkcolorbutton.h"
#include "gtkbutton.h"
#include "gtkmain.h"
#include "gtkcolorchooser.h"
#include "gtkcolorchooserprivate.h"
#include "gtkcolorchooserdialog.h"
#include "gtkcolorswatchprivate.h"
#include "gtkdnd.h"
#include "gtkdragdest.h"
#include "gtkdragsource.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkintl.h"
/**
* SECTION:gtkcolorbutton
* @Short_description: A button to launch a color selection dialog
* @Title: GtkColorButton
* @See_also: #GtkFontButton
*
* The #GtkColorButton is a button which displays the currently selected
* color and allows to open a color selection dialog to change the color.
* It is suitable widget for selecting a color in a preference dialog.
*
* # CSS nodes
*
* GtkColorButton has a single CSS node with name button. To differentiate
* it from a plain #GtkButton, it gets the .color style class.
*/
struct _GtkColorButtonPrivate
{
GtkWidget *button;
GtkWidget *swatch; /* Widget where we draw the color sample */
GtkWidget *cs_dialog; /* Color selection dialog */
gchar *title; /* Title for the color selection window */
GdkRGBA rgba;
guint use_alpha : 1; /* Use alpha or not */
guint show_editor : 1;
};
/* Properties */
enum
{
PROP_0,
PROP_USE_ALPHA,
PROP_TITLE,
PROP_RGBA,
PROP_SHOW_EDITOR
};
/* Signals */
enum
{
COLOR_SET,
LAST_SIGNAL
};
/* gobject signals */
static void gtk_color_button_finalize (GObject *object);
static void gtk_color_button_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_color_button_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
/* gtkbutton signals */
static void gtk_color_button_clicked (GtkButton *button,
gpointer user_data);
/* source side drag signals */
static void gtk_color_button_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data);
static void gtk_color_button_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
GtkColorButton *button);
/* target side drag signals */
static void gtk_color_button_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
GtkColorButton *button);
static guint color_button_signals[LAST_SIGNAL] = { 0 };
static const GtkTargetEntry drop_types[] = { { (char *) "application/x-color", 0, 0 } };
static void gtk_color_button_iface_init (GtkColorChooserInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkColorButton, gtk_color_button, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkColorButton)
G_IMPLEMENT_INTERFACE (GTK_TYPE_COLOR_CHOOSER,
gtk_color_button_iface_init))
static void
gtk_color_button_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkColorButton *button = GTK_COLOR_BUTTON (widget);
GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
gtk_widget_measure (priv->button, orientation, for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_color_button_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkColorButton *button = GTK_COLOR_BUTTON (widget);
GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
gtk_widget_snapshot_child (widget, priv->button, snapshot);
}
static void
gtk_color_button_size_allocate (GtkWidget *widget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip)
{
GtkColorButton *button = GTK_COLOR_BUTTON (widget);
GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
gtk_widget_size_allocate (priv->button, allocation, baseline, out_clip);
}
static void
gtk_color_button_class_init (GtkColorButtonClass *klass)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
gobject_class = G_OBJECT_CLASS (klass);
widget_class = GTK_WIDGET_CLASS (klass);
gobject_class->get_property = gtk_color_button_get_property;
gobject_class->set_property = gtk_color_button_set_property;
gobject_class->finalize = gtk_color_button_finalize;
widget_class->snapshot = gtk_color_button_snapshot;
widget_class->measure = gtk_color_button_measure;
widget_class->size_allocate = gtk_color_button_size_allocate;
klass->color_set = NULL;
/**
* GtkColorButton:use-alpha:
*
* If this property is set to %TRUE, the color swatch on the button is
* rendered against a checkerboard background to show its opacity and
* the opacity slider is displayed in the color selection dialog.
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_USE_ALPHA,
g_param_spec_boolean ("use-alpha", P_("Use alpha"),
P_("Whether to give the color an alpha value"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkColorButton:title:
*
* The title of the color selection dialog
*
* Since: 2.4
*/
g_object_class_install_property (gobject_class,
PROP_TITLE,
g_param_spec_string ("title",
P_("Title"),
P_("The title of the color selection dialog"),
_("Pick a Color"),
GTK_PARAM_READWRITE));
/**
* GtkColorButton:rgba:
*
* The RGBA color.
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
PROP_RGBA,
g_param_spec_boxed ("rgba",
P_("Current RGBA Color"),
P_("The selected RGBA color"),
GDK_TYPE_RGBA,
GTK_PARAM_READWRITE));
/**
* GtkColorButton::color-set:
* @widget: the object which received the signal.
*
* The ::color-set signal is emitted when the user selects a color.
* When handling this signal, use gtk_color_chooser_get_rgba() to
* find out which color was just selected.
*
* Note that this signal is only emitted when the user
* changes the color. If you need to react to programmatic color changes
* as well, use the notify::color signal.
*
* Since: 2.4
*/
color_button_signals[COLOR_SET] = g_signal_new (I_("color-set"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkColorButtonClass, color_set),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GtkColorButton:show-editor:
*
* Set this property to %TRUE to skip the palette
* in the dialog and go directly to the color editor.
*
* This property should be used in cases where the palette
* in the editor would be redundant, such as when the color
* button is already part of a palette.
*
* Since: 3.20
*/
g_object_class_install_property (gobject_class,
PROP_SHOW_EDITOR,
g_param_spec_boolean ("show-editor", P_("Show Editor"),
P_("Whether to show the color editor right away"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
}
static void
gtk_color_button_drag_data_received (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection_data,
guint info,
guint32 time,
GtkColorButton *button)
{
GtkColorButtonPrivate *priv = button->priv;
gint length;
guint16 *dropped;
length = gtk_selection_data_get_length (selection_data);
if (length < 0)
return;
/* We accept drops with the wrong format, since the KDE color
* chooser incorrectly drops application/x-color with format 8.
*/
if (length != 8)
{
g_warning ("%s: Received invalid color data", G_STRFUNC);
return;
}
dropped = (guint16 *) gtk_selection_data_get_data (selection_data);
priv->rgba.red = dropped[0] / 65535.;
priv->rgba.green = dropped[1] / 65535.;
priv->rgba.blue = dropped[2] / 65535.;
priv->rgba.alpha = dropped[3] / 65535.;
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (priv->swatch), &priv->rgba);
g_signal_emit (button, color_button_signals[COLOR_SET], 0);
g_object_freeze_notify (G_OBJECT (button));
g_object_notify (G_OBJECT (button), "rgba");
g_object_thaw_notify (G_OBJECT (button));
}
static void
set_color_icon (GdkDragContext *context,
const GdkRGBA *rgba)
{
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 48, 32);
cr = cairo_create (surface);
gdk_cairo_set_source_rgba (cr, rgba);
cairo_paint (cr);
gtk_drag_set_icon_surface (context, surface);
cairo_destroy (cr);
cairo_surface_destroy (surface);
}
static void
gtk_color_button_drag_begin (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkColorButton *button = data;
set_color_icon (context, &button->priv->rgba);
}
static void
gtk_color_button_drag_data_get (GtkWidget *widget,
GdkDragContext *context,
GtkSelectionData *selection_data,
guint info,
guint time,
GtkColorButton *button)
{
GtkColorButtonPrivate *priv = button->priv;
guint16 dropped[4];
dropped[0] = (guint16) (priv->rgba.red * 65535);
dropped[1] = (guint16) (priv->rgba.green * 65535);
dropped[2] = (guint16) (priv->rgba.blue * 65535);
dropped[3] = (guint16) (priv->rgba.alpha * 65535);
gtk_selection_data_set (selection_data,
gtk_selection_data_get_target (selection_data),
16, (guchar *)dropped, 8);
}
static void
gtk_color_button_init (GtkColorButton *button)
{
GtkColorButtonPrivate *priv;
PangoLayout *layout;
PangoRectangle rect;
GtkStyleContext *context;
gtk_widget_set_has_window (GTK_WIDGET (button), FALSE);
/* Create the widgets */
priv = button->priv = gtk_color_button_get_instance_private (button);
priv->button = gtk_button_new ();
g_signal_connect (priv->button, "clicked", G_CALLBACK (gtk_color_button_clicked), button);
gtk_widget_set_parent (priv->button, GTK_WIDGET (button));
priv->swatch = gtk_color_swatch_new ();
layout = gtk_widget_create_pango_layout (GTK_WIDGET (button), "Black");
pango_layout_get_pixel_extents (layout, NULL, &rect);
g_object_unref (layout);
gtk_widget_set_size_request (priv->swatch, rect.width, rect.height);
gtk_container_add (GTK_CONTAINER (priv->button), priv->swatch);
button->priv->title = g_strdup (_("Pick a Color")); /* default title */
/* Start with opaque black, alpha disabled */
priv->rgba.red = 0;
priv->rgba.green = 0;
priv->rgba.blue = 0;
priv->rgba.alpha = 1;
priv->use_alpha = FALSE;
gtk_drag_dest_set (priv->button,
GTK_DEST_DEFAULT_MOTION |
GTK_DEST_DEFAULT_HIGHLIGHT |
GTK_DEST_DEFAULT_DROP,
drop_types, 1, GDK_ACTION_COPY);
gtk_drag_source_set (priv->button,
GDK_BUTTON1_MASK|GDK_BUTTON3_MASK,
drop_types, 1,
GDK_ACTION_COPY);
g_signal_connect (priv->button, "drag-begin",
G_CALLBACK (gtk_color_button_drag_begin), button);
g_signal_connect (priv->button, "drag-data-received",
G_CALLBACK (gtk_color_button_drag_data_received), button);
g_signal_connect (priv->button, "drag-data-get",
G_CALLBACK (gtk_color_button_drag_data_get), button);
context = gtk_widget_get_style_context (GTK_WIDGET (priv->button));
gtk_style_context_add_class (context, "color");
}
static void
gtk_color_button_finalize (GObject *object)
{
GtkColorButton *button = GTK_COLOR_BUTTON (object);
GtkColorButtonPrivate *priv = button->priv;
if (priv->cs_dialog != NULL)
gtk_widget_destroy (priv->cs_dialog);
g_free (priv->title);
gtk_widget_unparent (priv->button);
G_OBJECT_CLASS (gtk_color_button_parent_class)->finalize (object);
}
/**
* gtk_color_button_new:
*
* Creates a new color button.
*
* This returns a widget in the form of a small button containing
* a swatch representing the current selected color. When the button
* is clicked, a color-selection dialog will open, allowing the user
* to select a color. The swatch will be updated to reflect the new
* color when the user finishes.
*
* Returns: a new color button
*
* Since: 2.4
*/
GtkWidget *
gtk_color_button_new (void)
{
return g_object_new (GTK_TYPE_COLOR_BUTTON, NULL);
}
/**
* gtk_color_button_new_with_rgba:
* @rgba: A #GdkRGBA to set the current color with
*
* Creates a new color button.
*
* Returns: a new color button
*
* Since: 3.0
*/
GtkWidget *
gtk_color_button_new_with_rgba (const GdkRGBA *rgba)
{
return g_object_new (GTK_TYPE_COLOR_BUTTON, "rgba", rgba, NULL);
}
static gboolean
dialog_delete_event (GtkWidget *dialog,
GdkEvent *event,
gpointer user_data)
{
g_signal_emit_by_name (dialog, "response", GTK_RESPONSE_CANCEL);
return TRUE;
}
static gboolean
dialog_destroy (GtkWidget *widget,
gpointer data)
{
GtkColorButton *button = GTK_COLOR_BUTTON (data);
button->priv->cs_dialog = NULL;
return FALSE;
}
static void
dialog_response (GtkDialog *dialog,
gint response,
gpointer data)
{
if (response == GTK_RESPONSE_CANCEL)
gtk_widget_hide (GTK_WIDGET (dialog));
else if (response == GTK_RESPONSE_OK)
{
GtkColorButton *button = GTK_COLOR_BUTTON (data);
GtkColorButtonPrivate *priv = button->priv;
gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (dialog), &priv->rgba);
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (priv->swatch), &priv->rgba);
gtk_widget_hide (GTK_WIDGET (dialog));
g_object_ref (button);
g_signal_emit (button, color_button_signals[COLOR_SET], 0);
g_object_freeze_notify (G_OBJECT (button));
g_object_notify (G_OBJECT (button), "rgba");
g_object_thaw_notify (G_OBJECT (button));
g_object_unref (button);
}
}
/* Create the dialog and connects its buttons */
static void
ensure_dialog (GtkColorButton *button)
{
GtkColorButtonPrivate *priv = button->priv;
GtkWidget *parent, *dialog;
if (priv->cs_dialog != NULL)
return;
parent = gtk_widget_get_toplevel (GTK_WIDGET (button));
priv->cs_dialog = dialog = gtk_color_chooser_dialog_new (priv->title, NULL);
if (gtk_widget_is_toplevel (parent) && GTK_IS_WINDOW (parent))
{
if (GTK_WINDOW (parent) != gtk_window_get_transient_for (GTK_WINDOW (dialog)))
gtk_window_set_transient_for (GTK_WINDOW (dialog), GTK_WINDOW (parent));
gtk_window_set_modal (GTK_WINDOW (dialog),
gtk_window_get_modal (GTK_WINDOW (parent)));
}
g_signal_connect (dialog, "response",
G_CALLBACK (dialog_response), button);
g_signal_connect (dialog, "destroy",
G_CALLBACK (dialog_destroy), button);
g_signal_connect (dialog, "delete-event",
G_CALLBACK (dialog_delete_event), button);
}
static void
gtk_color_button_clicked (GtkButton *b,
gpointer user_data)
{
GtkColorButton *button = user_data;
GtkColorButtonPrivate *priv = button->priv;
/* if dialog already exists, make sure it's shown and raised */
ensure_dialog (button);
g_object_set (priv->cs_dialog, "show-editor", priv->show_editor, NULL);
gtk_color_chooser_set_use_alpha (GTK_COLOR_CHOOSER (priv->cs_dialog), priv->use_alpha);
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (priv->cs_dialog), &priv->rgba);
gtk_window_present (GTK_WINDOW (priv->cs_dialog));
}
static void
gtk_color_button_set_rgba (GtkColorChooser *chooser,
const GdkRGBA *rgba)
{
GtkColorButtonPrivate *priv;
g_return_if_fail (GTK_IS_COLOR_BUTTON (chooser));
g_return_if_fail (rgba != NULL);
priv = GTK_COLOR_BUTTON (chooser)->priv;
priv->rgba = *rgba;
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (priv->swatch), &priv->rgba);
g_object_notify (G_OBJECT (chooser), "rgba");
}
static void
gtk_color_button_get_rgba (GtkColorChooser *chooser,
GdkRGBA *rgba)
{
g_return_if_fail (GTK_IS_COLOR_BUTTON (chooser));
g_return_if_fail (rgba != NULL);
*rgba = GTK_COLOR_BUTTON (chooser)->priv->rgba;
}
static void
set_use_alpha (GtkColorButton *button,
gboolean use_alpha)
{
GtkColorButtonPrivate *priv = button->priv;
use_alpha = (use_alpha != FALSE);
if (priv->use_alpha != use_alpha)
{
priv->use_alpha = use_alpha;
gtk_color_swatch_set_use_alpha (GTK_COLOR_SWATCH (priv->swatch), use_alpha);
g_object_notify (G_OBJECT (button), "use-alpha");
}
}
/**
* gtk_color_button_set_title:
* @button: a #GtkColorButton
* @title: String containing new window title
*
* Sets the title for the color selection dialog.
*
* Since: 2.4
*/
void
gtk_color_button_set_title (GtkColorButton *button,
const gchar *title)
{
GtkColorButtonPrivate *priv = button->priv;
gchar *old_title;
g_return_if_fail (GTK_IS_COLOR_BUTTON (button));
old_title = priv->title;
priv->title = g_strdup (title);
g_free (old_title);
if (priv->cs_dialog)
gtk_window_set_title (GTK_WINDOW (priv->cs_dialog), priv->title);
g_object_notify (G_OBJECT (button), "title");
}
/**
* gtk_color_button_get_title:
* @button: a #GtkColorButton
*
* Gets the title of the color selection dialog.
*
* Returns: An internal string, do not free the return value
*
* Since: 2.4
*/
const gchar *
gtk_color_button_get_title (GtkColorButton *button)
{
g_return_val_if_fail (GTK_IS_COLOR_BUTTON (button), NULL);
return button->priv->title;
}
static void
gtk_color_button_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
GtkColorButton *button = GTK_COLOR_BUTTON (object);
switch (param_id)
{
case PROP_USE_ALPHA:
set_use_alpha (button, g_value_get_boolean (value));
break;
case PROP_TITLE:
gtk_color_button_set_title (button, g_value_get_string (value));
break;
case PROP_RGBA:
gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (button), g_value_get_boxed (value));
break;
case PROP_SHOW_EDITOR:
{
gboolean show_editor = g_value_get_boolean (value);
if (button->priv->show_editor != show_editor)
{
button->priv->show_editor = show_editor;
g_object_notify (object, "show-editor");
}
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
gtk_color_button_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
GtkColorButton *button = GTK_COLOR_BUTTON (object);
switch (param_id)
{
case PROP_USE_ALPHA:
g_value_set_boolean (value, button->priv->use_alpha);
break;
case PROP_TITLE:
g_value_set_string (value, gtk_color_button_get_title (button));
break;
case PROP_RGBA:
{
GdkRGBA rgba;
gtk_color_chooser_get_rgba (GTK_COLOR_CHOOSER (button), &rgba);
g_value_set_boxed (value, &rgba);
}
break;
case PROP_SHOW_EDITOR:
g_value_set_boolean (value, button->priv->show_editor);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
gtk_color_button_add_palette (GtkColorChooser *chooser,
GtkOrientation orientation,
gint colors_per_line,
gint n_colors,
GdkRGBA *colors)
{
GtkColorButton *button = GTK_COLOR_BUTTON (chooser);
ensure_dialog (button);
gtk_color_chooser_add_palette (GTK_COLOR_CHOOSER (button->priv->cs_dialog),
orientation, colors_per_line, n_colors, colors);
}
static void
gtk_color_button_iface_init (GtkColorChooserInterface *iface)
{
iface->get_rgba = gtk_color_button_get_rgba;
iface->set_rgba = gtk_color_button_set_rgba;
iface->add_palette = gtk_color_button_add_palette;
}
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